SG90 Servo Motor with Arduino: Complete Beginner Guide (2026)

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SG90 Servo Motor with Arduino: Complete Beginner Guide (2026)

The SG90 Micro Servo Motor is one of the most popular servo motors for Arduino projects. Whether you're building a robotic arm, a pan-tilt camera, or a smart automation system, learning how to control a servo is an essential skill.

In this guide, you'll learn:

What the SG90 servo motor is
How it works
Pin configuration
Arduino wiring
Arduino code
Troubleshooting
Practical applications

What Is an SG90 Servo Motor?

The SG90 is a lightweight 9g micro servo capable of rotating approximately 180°. Unlike a standard DC motor, it can move to a precise angle and hold that position using an internal feedback mechanism.

Inside the servo are:

DC motor
Plastic gear train
Position feedback potentiometer
Internal controller

Because of its simplicity and affordability, it's widely used in:

Arduino projects
Robotics
DIY automation
RC vehicles
Camera pan-tilt systems
Educational STEM projects

SG90 Specifications

Feature	Value
Voltage	4.8–6V
Recommended Voltage	5V
Rotation	~180°
Weight	9g
Torque	~1.8 kg·cm
Control	Servo Pulse

Pinout

The SG90 has three wires.

Color	Function
Brown	GND
Red	+5V
Orange	Signal

Arduino Wiring

Arduino	SG90
5V	Red
GND	Brown
D9	Orange

For one unloaded servo, Arduino 5V is usually enough.

For multiple servos or higher loads, use an external regulated 5V supply.

Real Hardware Connection

Before uploading the sketch:

Verify wiring
Ensure correct polarity
Check jumper connections
Make sure the servo horn moves freely ## Arduino Code

#include <Servo.h>

Servo myServo;

void setup() {
    myServo.attach(9);
}

void loop() {
    myServo.write(0);
    delay(1000);

    myServo.write(90);
    delay(1000);

    myServo.write(180);
    delay(1000);
}

This sketch rotates the servo between 0°, 90°, and 180° continuously.

Servo Rotation

The Arduino converts angle values into servo control pulses.

Command	Position
write(0)	0°
write(90)	90°
write(180)	180°

Troubleshooting

If the servo doesn't move:

Check the wiring.
Verify the power supply.
Confirm that the signal wire is connected to pin 9.

If the Arduino keeps restarting:

Use an external 5V power supply.
Connect the external power supply ground to Arduino GND.

If the servo jitters:

Improve the power supply.
Reduce electrical noise.
Shorten jumper wires.

Applications

The SG90 is commonly used in:

Robotic arms
Robot cars
Smart door locks
Pan-tilt systems
RC aircraft
DIY automation
Sensor positioning

Conclusion

The SG90 Micro Servo Motor is one of the best components for beginners learning Arduino and robotics.

Once you understand servo control, you'll be ready to build more advanced projects such as robotic arms, camera gimbals, autonomous robots, and IoT automation systems.